It's really just a warning.

There's no way for it to know how many (T)emp variables you are using in your interrupt routines, or how many are used in the main progam. And it's only set up to handle 7 Temp variables (18F's), so it throws a warning if there's more.

Usually, interrupt handlers are fairly simple, and don't use many (if any) (T)emp variables.

But you should check to make sure there aren't any "Really Complex" formula's inside the interrupt handler.

If you are sure that no more than T7 is used in the handlers, use ...
Code:
DEFINE  NO_T7_WARNING 1
HTH,